My name is MsKatieKat and I'm a Pinterest-holic!
http://pinterest.com/mskatiekat/
Una: To answer your question - I'm not sure if you did this as a teen but Pinterest is similar to ripping pictures you like in a magazine and filing them someplace. I used to do this a lot when I was younger to look for fashion inspiration.
In Pinterest you can have different boards. Each board can be a category or collection of your choice. For instance - if you want to have a place to file all the Fall Fashions you collect, you can create a board called Fall Fashion.
As for pinning - there are several ways to do it.
1) You can look through your friends' most recent pins and repin
2) Underneath the PINTEREST logo on your home screen, there is a navigation bar. Select "Categories" and look for the category that interest you. Browse for pins there.
3) Search anything you want on the search on the upper left hand side of the home page. It will show you results underneath. Repin what catches your eye.
4) Some blogs, vendors, websites have the PIN button on their website. You can click that and pin it to the board you want.
5) Install the PIN button on your browser.
And that's it!